The relief valve on the discharge side of the fuel oil service pump may discharge directly to the suction side of the pump, or to the __________.

Correct Answer: Option C — fuel oil settling tank

Positive displacement fuel oil service pumps utilize discharge relief valves that typically recirculate excess fuel back to the settling tank. This continuous loop maintains proper system pressure while ensuring heated, unburned fuel returns to a storage medium rather than causing pump cavitation or overpressurization.